Change MTU size?

January 30, 2021 22:48

Hi, is there a way to change the MTU size in Firewalla? I've got my Gold plugged into a gig switch which I can configure the MTU size, and I'm hoping to use jumbo packets.

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5 comments

Firewalla

January 31, 2021 06:33
Any reasons you want to do this? MTU greater than 1500 will only work on your LAN. If you engineered correctly, your LAN traffic should not pass through Firewalla. (unless you are segmenting)
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Richard Sun

January 31, 2021 19:42
Yes, routing between different segments off of the different physical Ethernet ports in the Firewalla Gold.
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Firewalla

January 31, 2021 19:59
We tried not to mess around with MTU's, but if you are willing to try (you will need to know how to access the shell). But, even with default MTU, you should get gigabit-speed when doing segment to segment transfers.

This command should be able to change the MTU, if anything wrong, you just need to reboot, it will back to the original MTU
```
sudo ip link set dev eth0 mtu 9000
```
Please replace eth0 with the interface you want to change.
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Richard Sun

January 31, 2021 21:29
This worked and traffic seems to be flowing just fine. However, how do I make this persistent? I rebooted the Firewalla Gold and it was back to mtu 1500.
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Richard Sun

January 31, 2021 21:41
No worries, found the help document. I'm all good. Thanks again for your support!

https://help.firewalla.com/hc/en-us/articles/360054056754--Firewalla-Gold-Customized-Scripting-
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